Method for treating arsenic-containing wastewater by using multiphase Fenton system based iron oxide

A technology for iron oxides and wastewater, applied in the field of water treatment, can solve problems such as arsenic-containing wastewater pollution, and achieve the effects of improving removal capacity, efficient degradation and transformation, and efficient adsorption

Inactive Publication Date: 2017-01-04
HEFEI UNIV OF TECH
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Problems solved by technology

[0008] The present invention mainly aims to solve the increasingly serious problem of arsenic-containing wastewater pollution in China, and provides a method for treating arsenic-containing wastewater by using an iron oxide multiphase Fenton system. Simultaneously achieve the two goals of efficient degradation of organic arsenic and specific adsorption of inorganic arsenic. While achieving high-efficiency treatment capacity and simple process operation for arsenic-containing wastewater, it also provides a new idea and method for treating arsenic-containing wastewater

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  • Method for treating arsenic-containing wastewater by using multiphase Fenton system based iron oxide

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[0033] Roxarsone (ROX) is a toxic and highly water-soluble compound. It is often used as an additive in poultry breeding feed to inhibit the growth of cocci, and it is almost excreted with feces in poultry without being digested. Roxarsone can also be used as an auxin for pigs and broilers. When chicken manure is used as fertilizer, roxarsone can quickly transform into toxic derivatives that contaminate soil and groundwater. These derivatives include arsenate [As(V)] and arsenite [As(III)], dimethylarsinic acid (DMA) and 4-hydroxy-3-amino-phenylarsinic acid (HAPA), which The formation of compounds depends on the oxidation conditions.

[0034] In our country, if the wastewater from farms is directly discharged into natural water bodies, there is bound to be a risk of arsenic pollution. Therefore, it is necessary to design a targeted treatment process to remove roxarsone. The removal of roxarsone generally includes two steps. Firstly, roxarsone is degraded into inorganic arse...

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Abstract

The invention discloses a method for treating arsenic-containing wastewater by using a multiphase Fenton system based on iron oxide. The method is characterized in that firstly, the pH of the arsenic-containing wastewater is adjusted to range from 2.0 to 9.0, then an iron oxide catalyst and a hydrogen peroxide oxidizing agent are added, so that an organic arsenic compound completes form transformation from organic arsenic to inorganic arsenic in the multiphase Fenton system based on the iron oxide, meanwhile, released inorganic arsenic forms Fe-As chemical coordinate bonds through binding state iron central atoms on the surface of the iron oxide to be effectively adsorbed, and the arsenic pollutant in the arsenic-containing wastewater is removed. Degradation from organic arsenic to inorganic arsenic and adsorption of the inorganic arsenic can be finished simultaneously in one step, the iron oxide serves as an efficient adsorption material of the inorganic arsenic as well as a Fenton reaction catalyst for degrading the organic arsenic to the inorganic arsenic, and the treatment cost of the organic arsenic wastewater is effectively reduced while the reaction efficiency and the operation simplicity are greatly improved.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to the efficient treatment of arsenic-containing wastewater. Background technique [0002] Arsenic (Arsenic) is located in group VA of the fourth period of the periodic table of elements, and is a transition element from a typical non-metal element to a typical metal element. Arsenic has a low melting point and is volatile, and it is relatively stable in water and air at room temperature. The physical properties of arsenic are similar to those of metals, it is shiny, and has good electrical and thermal conductivity, so it is called metalloid. Arsenic can exhibit various valence states, the main valence states are positive trivalent and positive pentavalent. [0003] At present, there are roughly several arsenic removal technologies at home and abroad: coagulation method, direct precipitation method, ion exchange method, biological method, and adsorption method. Coagulation method i...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72C02F101/30
CPCC02F1/722C02F1/725C02F2101/30C02F2305/026
Inventor 张爱勇何元易林坦黄乃辉
Owner HEFEI UNIV OF TECH
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